I did it. But I'm logged in with another user...
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sharkbaitApr 16 '13 at 8:50

This is a solution. But one question: if I'm logged in with another user, I have to manually copy from terminal files in the usb device. I would copy them with drag and drop, not with the cp command
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sharkbaitApr 16 '13 at 9:01

For USB devices you would most likely use udisks as if correctly set up it does not require mount privileges etc. (You won't have to sudo it). Try running udisks --monitor and re-plug device. It should be detected and mounted. Check system logs etc. and debug from there.
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SukminderApr 16 '13 at 9:33

On linux systems and many Unix systems, entries in the file /etc/fstab govern whether and where a device is mounted at startup. Use the command man fstab for details about fstab entries. Here are some examples:

Items with a user keyword in them allow the user to mount or umount the corresponding device without needing to use sudo or su. Items with auto mount automatically on system startup (and if not present may cause startup problems). Items with rw are mounted read-write.

When fstab entries specify both a device and a mount point the mount command only needs to give one of them. For example, given the above entries, /dev/sdf1 can be mounted by the user at /sf1 by either of the following commands:

mount /sf1
mount /dev/sdf1

On linux systems or Unix systems with /proc you can see a list of partitions, mounted or not, via

cat /proc/partitions

If you know the UUID's of partitions on your USB drive, you can use the UUID instead of the device name in its fstab entry. On some linux systems, use

I am using centOS 7 with the Mate desktop. I ran into a the problem of not being able to mount a USB disk. Short answer. Make sure that you have the desired users that you want to be able to mount USB devises to the disk group.